(1) Calcium khi rau troponin C, ua rau muaj kev hloov pauv hauv tropomyosin uas nthuav tawm myosin-binding qhov chaw ntawm actin.
Thaum calcium tso tawm thaum lub cev nqaij daim tawv nws khi rau?
Cov leeg nqaij: Calcium tseem nyob hauv sarcoplasmic reticulum kom txog thaum tso tawm los ntawm kev txhawb nqa. Calcium ces khi rau troponin, ua rau troponin hloov pauv thiab tshem tawm tropomyosin los ntawm qhov chaw khi.
calcium khi nyob rau hauv cov leeg nqaij qhov twg los txhawb kev cog lus?
Piav qhia: rau pob txha pob txha cleaction, calcium binds rautroponin los nthuav tawm cov chaw ua si. Txhawm rau kom cov leeg pob txha pob txha tshwm sim, cov protein myosin yuav tsum tau khi rau cov protein actin thiab xaub nws kom txo tau qhov ntev ntawm sarcomere, uas yog lub contractile unit ntawm ib leeg.
Yuav ua li cas thaum calcium khi troponin?
Thaum khi calcium, troponin txav tropomyosin kom deb ntawm myosin-binding qhov chaw ntawm actin (hauv qab), tshem tawm nws zoo.
Yuav ua li cas khi rau actin thaum cov leeg nqaij contraction?
Myosin khi rau actin ntawm qhov chaw sib txuas ntawm globular actin protein. Myosin muaj lwm qhov chaw sib txuas rau ATP ntawm qhov kev ua haujlwm enzymatic hydrolyzes ATP rau ADP, tso tawm ib qho inorganic phosphate molecule thiab lub zog. ATP khi ua rau myosin tso tawm actin, tso cai rau actin thiab myosin cais tawm ntawm txhua tuslwm yam.